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Miyajima Lab
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A lab exploring the behavior of excitons and spins through the interaction between light and matter.
AboutAbout the lab
Probing the states of electrons through light–matter interaction
The Miyajima Lab studies the energy levels, spin states, and dynamics of electrons, holes, and excitons from the viewpoint of light–matter interaction.
Using examples such as superfluorescence from semiconductor quantum dots and photoinduced magnetization in semimagnetic semiconductors, the lab takes on the challenge of creating and controlling novel optical phenomena and of exploring optical functionality such as optical nonlinearity and ultrafast response.
Most of the systems used for optical experiments are built by the lab members themselves.
The lab also studies the optical properties of SiC nanostructures. SiC is a material used in power devices.
Key terms
- Exciton
- A bound state of an electron and a hole in a semiconductor. It has energy levels similar to those of a hydrogen atom.
- Quantum dot
- A tiny particle made of a semiconductor. This lab uses CuCl quantum dots.
- Superfluorescence
- A phenomenon in which many two-level systems, triggered by a single fluorescence emission, align their dipole moments and emit a pulse of light.
- Optical Stark effect
- A phenomenon in which an electronic system coupled with a strong optical field forms dressed states that incorporate photons, causing the energy levels to split.
ResearchResearch themes
The Miyajima Lab experimentally investigates how electrons and excitons in semiconductors interact with light and what optical phenomena result. Its main research areas are superfluorescence in quantum dots, the optical Stark effect of excitons, electron spin dynamics, photoinduced magnetization in semimagnetic semiconductors, and luminescence from SiC nanostructures.
*Illustrative imageSuperfluorescence from quantum dots
The lab investigates the mechanism by which superfluorescence, in which many two-level systems emit light together, occurs in ensembles of semiconductor quantum dots. Using CuCl quantum dots, the lab explores the generation of ultrashort-pulse superfluorescence that is faster than in atomic and molecular systems, as well as generation mechanisms specific to quantum dots.
*Illustrative imageExcitons dressed by light
The lab studies the optical Stark effect between the 1s and 2p states of excitons in CuCl, which has a large binding energy. Coupling with a strong optical field creates dressed states, and the energy levels split.
*Illustrative imageElectron spin motion in semiconductors
The lab investigates the motion of electron spins in semiconductors through spatiotemporal measurements using pulsed lasers. It studies the temporal oscillations of ballistically moving electron spins in the persistent spin helix state, in which spin information is preserved.
*Illustrative imagePhotoinduced magnetization in semimagnetic semiconductors
In CdMnTe, a semimagnetic (diluted magnetic) semiconductor with added magnetic ions, the lab studies exciton magnetic polarons, which form through the interaction between excitons and the spins of Mn ions. The lab has reported that under high-density excitation the emission intensity changes nonlinearly and the emission peak wavelength redshifts.
MembersFaculty
The members of the Miyajima Lab consist of faculty members and master's and undergraduate students.As of 2026
- ProfessorKensuke Miyajima
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “First light of new laser on Adaptive Optics Facility at Paranal (ann15034b)” ESO/J. Girard (djulik.com) / CC BY 4.0 (cropped)
- Superfluorescence from quantum dots: “EFluor Nanocrystal Vials” Travis.jennings / CC BY 3.0 (cropped)
- Excitons dressed by light: “Atomic-scale growth by pulsed laser deposition ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Electron spin motion in semiconductors: “A semiconductor wafer being removed from processing equipment” YouTube — Purdue Engineering / CC BY 4.0 (cropped)
- Photoinduced magnetization in semimagnetic semiconductors: “Cryostat filled with liquid helium on an optical bench” Alkamid / CC BY-SA 3.0 (cropped)
- Related lab (伊藤研究室): “BURNED OUT SUPERCONDUCTING MAGNET COIL - NARA - 17450109” Martin Brown / Public domain (cropped)
- Related lab (宮川研究室): “Liquid helium dewar” Alkamid / CC BY-SA 3.0 (cropped)
- Related lab (後藤研究室): “3.5 inch hard disk drive, side view” Gunnar Wolf / CC BY-SA 4.0 (cropped)
- Related lab (遠山研究室): “High-Temperature Superconducting Cables ( )” National Institute of Standards and Technology / Public domain (cropped)
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